Phy 231
Your 'cq_1_24.2' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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A steel ball of mass 60 grams, moving at 80 cm / sec, collides with a stationary marble of mass 20 grams. As a result of the collision the steel ball slows to 50 cm / sec and the marble speeds up to 70 cm / sec.
• Is the total momentum of the system after collision the same as the total momentum before?
answer/question/discussion: ->->->->->->->->->->->-> :
initial momentum = 60 g * 80 cm/sec + 20 g * 0 cm/s
initial momentum = 4800 g*cm/sec
final momentum = 60 g * 50 cm/s + 20 g * 70 cm/sec
final momentum = 4400 g * cm/sec
No, they are not the same.
#$&*
• What would the marble velocity have to be in order to exactly conserve momentum, assuming the steel ball's velocities to be accurate?
answer/question/discussion: ->->->->->->->->->->->-> :
90 cm/sec
#$&*
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15 mins
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&#Very good responses. Let me know if you have questions. &#